US4070283A - Controlled surface porosity particles and a method for their production - Google Patents

Controlled surface porosity particles and a method for their production Download PDF

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Publication number
US4070283A
US4070283A US05/748,770 US74877076A US4070283A US 4070283 A US4070283 A US 4070283A US 74877076 A US74877076 A US 74877076A US 4070283 A US4070283 A US 4070283A
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United States
Prior art keywords
microparticles
ultramicroparticles
average diameter
substrate
range
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Expired - Lifetime
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US05/748,770
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English (en)
Inventor
Joseph Jack Kirkland
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EIDP Inc
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EI Du Pont de Nemours and Co
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Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to US05/748,770 priority Critical patent/US4070283A/en
Priority to CA292,468A priority patent/CA1088042A/en
Priority to NL7713515A priority patent/NL7713515A/xx
Priority to IT30521/77A priority patent/IT1089345B/it
Priority to DK544877AA priority patent/DK149835B/da
Priority to FR7736828A priority patent/FR2373493B1/fr
Priority to BE183240A priority patent/BE861590A/xx
Priority to DE19772754360 priority patent/DE2754360A1/de
Priority to SE7713893A priority patent/SE433009B/sv
Priority to GB51021/77A priority patent/GB1584730A/en
Priority to IE2484/77A priority patent/IE46009B1/en
Priority to JP14770877A priority patent/JPS5371699A/ja
Priority to LU78660A priority patent/LU78660A1/xx
Priority to CH1507977A priority patent/CH625886A5/de
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Publication of US4070283A publication Critical patent/US4070283A/en
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/281—Sorbents specially adapted for preparative, analytical or investigative chromatography
    • B01J20/282—Porous sorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/281—Sorbents specially adapted for preparative, analytical or investigative chromatography
    • B01J20/286—Phases chemically bonded to a substrate, e.g. to silica or to polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3289—Coatings involving more than one layer of same or different nature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3291—Characterised by the shape of the carrier, the coating or the obtained coated product
    • B01J20/3295—Coatings made of particles, nanoparticles, fibers, nanofibers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/51—Spheres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S516/00—Colloid systems and wetting agents; subcombinations thereof; processes of
    • Y10S516/922—Colloid systems having specified particle size, range, or distribution, e.g. bimodal particle distribution

Definitions

  • This invention relates to superficially porous macroparticles composed of an impervious core coated with a number of layers of like microparticles and to a process for their manufacture.
  • Such macroparticles are useful as column packings for chromatography, particularly liquid chromatography, as catalysts and as catalyst bases.
  • the impervious core comprises a glass bead with an average diameter in the range of about 5 to about 100 microns
  • the microparticles have an average diameter in the range of about 5 to about 500 millimicrons
  • the ultramicroparticles have an average diameter in the range of about 1.0 to about 8 millimicrons
  • both the microparticles and the ultramicroparticles consisting essentially of silica and the diameter of the ultramicroparticles are no more than one quarter the average pore diameter.
  • a powder of macroparticles comprising an impervious core having an average diameter in the range of about 5 to about 500 microns and at least two monolayers of like microparticles adhered to the core, each microparticle having an average diameter in the range of about 0.005 to about 1 micron;
  • each microparticle with at least two layers of ultramicroparticles having an average diameter in the range of about 1.0 to about 15 millimicrons, the diameter of the ultramicroparticles being no more than 1/4 the average diameter of the pores between the microparticles adhered to the core.
  • FIG. 1 is a diagrammatical representation of a partially cut-away cross-section of one embodiment of the superficially porous macroparticles of the present invention
  • FIG. 2 is an exploded view of a portion of the superficially porous macroparticle of FIG. 1;
  • FIG. 3 is a diagrammatical representation of a cross-section of a portion of another embodiment of a superficially porous macroparticle of the present invention.
  • FIG. 4 is a schematic representation of a chromatograph showing the resolving zone containing the superficially porous macroparticle of the present invention
  • FIG. 5 is a comparison chromatogram showing the respective separations achieved using a powder of the superficially porous macroparticle of the present invention and a powder of prior art particles;
  • FIG. 6 is a plot of plate height versus carrier velocity for the superficially porous particles of the present invention.
  • the present invention relates to a powder of discrete superficially porous macroparticles such as that shown diagrammatically and in partial cut-away cross-section in FIGS. 1 and 2.
  • the superficially porous macroparticles comprise a core 12 which functions as a substrate for the remaining portion of the macroparticle. Adhered to the surface of the core are at least two monolayers of like microparticles 13. Adhered to the surface of each microparticle 13 are at least two monolayers of like ultramicroparticles 14. Dispersed between the ultramicroparticle coated microparticle are pores 15. Between the ultramicroparticles, and barely discernable in the Figures, are smaller pores 23.
  • the superficially porous particles of the present invention differ from those of the prior art by the coating of ultramicroparticles on each of the microparticles and on the exposed surface of the core.
  • the presence of these ultramicroparticles has two effects. First of all, the surface area of the superficially porous macroparticle is increased several-fold.
  • the superficially porous macroparticles of the present invention have a bimodal pore size distribution; large pores between the ultramicroparticle coated microparticle, and small pores between each ultramicroparticle. This bimodal pore distribution has advantages in certain types of chromatographic separation.
  • impervious material suitable for the intended use (e.g., chromatography) may be used as the core of the macroparticle.
  • impervious material is meant a material having a surface sufficiently free from pores that when employed as the substrate in a chromatographic process, the materials passing through the resolving zone will not pass into the body or interior of the core.
  • the maximum diameter of the pores on the surface of the core should not be greater than about 5% of the diameter of the microparticle used as the coating.
  • the core should be impervious to nitrogen gas.
  • the shape of the core is not critical, although regularly shaped macroparticles, in particular spheres, are preferred because of their uniform packing characteristics.
  • the size of the core and the size of the total macroparticle can be considered to be the same since the coating of microparticle is very thin.
  • the core has an average diameter in the range of about 5 to about 500 microns, preferably about 5 to about 100 microns.
  • the composition of the core is also not critical except that it should be suitable to the conditions necessary to prepare the coating and suitable for the intended use.
  • the cores can, for example, be made from glass, sand, ceramic, metal, or oxide. In addition to truly impervious materials such as these, other materials such as aluminosilicate molecular sieve crystals can be used. In general, materials which have some structural rigidity are preferred. Glass beads are especially preferred materials for the core because of their uniformity and surface characteristics and the predictability of their packing characteristics.
  • the microparticles used in the present invention have an average diameter in the range of about 0.005 to about 1.0 micron, preferably 5 to 500 millimicrons.
  • Each monolayer comprises like particles, but adjacent monolayers may be composed of different types of particles.
  • one layer may be silica microparticles and the next layer alumina microparticles.
  • the microparticles can be solid as shown in FIG. 1, or, as shown in FIG. 3, they can be composed of a core 16 of one type of material covered with a coating 17 of another type of material.
  • Like microparticles means microparticles which are alike in electrical charge and preferably, but not necessarily, in chemical composition.
  • the microparticles may be a mixture of colloidal particles of silica and colloidal particles of titanium dioxide coated previously with a thin layer of silica.
  • the microparticles may be any desired substance suitable for the intended use which can be reduced to a colloidal subdivision in which the microparticles have surfaces bearing ionic charges. They must be dispersible in a medium as a colloidal dispersion. Water is the best medium for dispersion of particles bearing ionic charges.
  • aqueous sols are amorphous silica, iron oxide, alumina, thoria, titania, zirconia, and aluminosilicates including colloidal clays.
  • Silica is the preferred material because of its low order of chemical activity, its ready dispersibility, and the easy availability of aqueous sols of various concentrations.
  • the ultramicroparticles of the present invention have an average diameter in the range of about 1.0 to 15 millimicrons, preferably 1.0 to 8 millimicrons.
  • the layers of ultramicroparticles are of like ultramicroparticles, but adjacent monolayers need not be of like ultramicroparticles.
  • the ultramicroparticles need not be made from the same materials as the microparticles. Generally, they are made from any material suitable for the intended use. Not all materials are available in such small sizes, however, and, for this reason, the ultramicroparticles are preferably silica. Silica sols of the required size are generally available commercially, e.g., Ludox* colloidal silica.
  • Any suitable organic material can be used in the interlayer, provided it is properly charged.
  • a positively charged material is used when the ultramicroparticles are silica.
  • One suitable positively charged material is the alkyl phosphate mixture sold as an antistatic agent under the trademark Zelec®.
  • Macroparticles comprising a core and at least two monolayers of like microparticles can be obtained from a number of sources.
  • Zipax* chromatographic supports are
  • 210 grams of 60-80 mesh soda-lime silica beads are soaked for about 2 hours in a 0.5% solution of Lakeseal® laboratory glass cleaner, the beads are washed thoroughly with water.
  • the wet beads are then placed in a tube which may consist of a length of 2 inch o.d. glass pipe fitted at the top and bottom with fine stainless steel screens. Excess water is removed from the beads by placing a vacuum on the bottom of the tube.
  • One hundred twenty-five ml. of a 0.5% colloidal dispersion of poly-(diethylaminoethylmethacrylate) acetate (poly-DEAM) is poured on the beads in the tube, the mixture stirred and allowed to stand for 5 minutes.
  • Excess poly-DEAM is removed by upflow washing of the bed with water. The beads are then dried by forcing air through the bed. Eighty milliliters of a 10% dispersion of 200 millimicron silica sol (pH 3.6) is added to the bed, the mixture stirred and allowed to stand for 15 minutes. Excess silica sol is removed by placing a vacuum on the bottom of the tube. The bed is washed free of excess silica sol by an upflow of water until the wash is clean, and the beads are air dried by placing a vacuum on the bottom of the tube.
  • the poly-DEAM silica sol treatment is repeated three additional times to build up successive layers of silica particles on the surface of the beads.
  • the coatings are permanentized by heating at a temperature high enough to decompose, volatilize, or oxidize the organic interlayer.
  • the particles may be dried and the organic interlayer removed by chemical means such as by oxidization.
  • the beads are first dried at 150° C. under vacuum for 16 hours and then heated to 725° C. for 1 hour.
  • colloidal silica containing 45% SiO 2 (Ludox® TM colloidal silica) was diluted with distilled water to 200 g total to obtain a solution approximately 10% in SiO 2 by weight. This pH 9.3 colloidal silica was stirred with a cation exchange resin (Rexyn® 101 - hydrogen form, sold by Fisher Scientific Co.) to deionize the colloidal silica and produce a final pH -- 3.6.
  • a cation exchange resin Rexyn® 101 - hydrogen form, sold by Fisher Scientific Co.
  • the Zelec® DX - Ludox® TM treatment was repeated successively three more times and the resulting particles dried for 1 hour at 115° C. in a circulating air oven. This dry powder was then heated in a muffle furnace at 650° C. for 2 hours to add mechanical stability. This step, which is not necessary, can be accomplished at any temperature above 125° C. which is sufficient to sinter but not fuse the ultramicroparticles in the time during which heating occurs. This material will be referred to as CSP adsorbent.
  • a liquid chromatographic column was prepared by packing 5.20 g of this material into a 100 cm ⁇ 0.21 cm i.d. precision bore stainless steel column according to the techniques described in J. J. Kirkland, ed., "Modern Practice of Liquid Chromatography", Wiley-Interscience, New York, 1971.
  • the column was equilibrated with the carrier liquid and subjected to a series of evaluation tests using a Du Pont 830 liquid chromatograph shown schematically in FIG. 4.
  • the column or resolving zone 18 was packed with the CSP adsorbent.
  • Carrier liquid (solvent) was introduced through line 19 and sample, introduced through line 21, was injected into the carrier stream by injection valve 20.
  • the constituents of the liquid emerging from the column were detected by detector 22.
  • FIG. 5 showed a separation which was obtained on a 7 microliter aliquot of (0.1 mg/ml desoxycorticosterone, 0.22 mg/ml dehydrocorticosterone, 0.22 mg/ml corticosterone, and 0.44 mg/ml hydrocortisone), using a carrier of hexane/chloroform/methanol (70:28:2).
  • the system was operated at a flow of 1.0 ml/min with an input pressure of 500 psi.
  • FIG. 5 is a published chromatogram of some steroids produced by a similar separation using Vydac®.
  • the peaks are identified as follows: A -- solvent, B -- desoxycorticosterone, C -- dehydrocorticosterone, D -- corticosterone, E -- hydrocortisone, and F -- cortisol.
  • the CSP adsorbent shows about 25% higher efficiency at about twice the carrier velocity (1.4 vs 0.75 cm/sec) using a solute with a k' value larger than that used with the Vydac® adsorbent (5.2 vs 3.9). These data again indicate that the CSP adsorbent is about twice as efficient as Vydac®. With the same carrier system the k' values for corticosterone are: CSP adsorbent -- 2.0; Vydac® adsorbent 1.2.
  • the cleaned Zipax® was placed in a 3 inch coarse sintered-glass funnel and 100 ml of 0.5% aqueous Zelec® DX solution added. The resulting mixture was allowed to stand for 5 minutes with frequent stirring, then washed twice with 350 ml of distilled water, filtered and dried in the funnel. The powder was then treated with 100 ml of 10% Ludox® AS (10% SiO - 125 g of commercial 30% SiO 2 Ludox® AS diluted to 400 ml with distilled water) and adjusted to pH 4-6 with nitric acid. The particles in this mixture have a diameter in the range of about 14 millimicrons. This mixture was allowed to stand for 15 minutes in the funnel with occasional gentle stirring. Excess silica sol was then removed by filtration and the resulting cake washed four times by stirring with 400 ml of tap water, followed by filtration. This material was allowed to air-dry in the filter.
  • the Zelec® DX - Ludox® AS treatment described above was carried out successively three more times on the powder and the resulting material heated at 650° C. for 2 hours to add mechanical stability.
  • This product was characterized at various steps in its preparation by dynamic nitrogen surface area measurements as shown in Table V below.
  • Reten® 205 cationic polymer Hercules, Inc., Wilmington, Delaware. This mixture was allowed to stand for 10 minutes with occasional gentle stirring. The excess Reten® 205 solution was then filtered off and the particles washed twice with 500 ml of distilled water by decantation. The treated particles were filtered off on a course sintered-glass funnel and allowed to air-dry.

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US05/748,770 1976-12-08 1976-12-08 Controlled surface porosity particles and a method for their production Expired - Lifetime US4070283A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
US05/748,770 US4070283A (en) 1976-12-08 1976-12-08 Controlled surface porosity particles and a method for their production
CA292,468A CA1088042A (en) 1976-12-08 1977-12-06 Controlled surface porosity particles and a method for their production
GB51021/77A GB1584730A (en) 1976-12-08 1977-12-07 Controlled surface porosity particles and a method for their production
DK544877AA DK149835B (da) 1976-12-08 1977-12-07 Pulver af overfladeporoese makropartikler samt dets anvendelse som stationaer fase i en chromatografikolonne.
FR7736828A FR2373493B1 (sv) 1976-12-08 1977-12-07
BE183240A BE861590A (fr) 1976-12-08 1977-12-07 Particules d'une porosite superficielle reglee et procede pour leur production
NL7713515A NL7713515A (nl) 1976-12-08 1977-12-07 Poeder van oppervlakkig poreuze macrodeeltjes en werkwijze voor de bereiding daarvan.
SE7713893A SE433009B (sv) 1976-12-08 1977-12-07 Pulver av pa ytan porosa makropartiklar samt anvendning av sadant pulver
IT30521/77A IT1089345B (it) 1976-12-08 1977-12-07 Particelle a porosita' superficiale controllata e metodo per la loro produzione
IE2484/77A IE46009B1 (en) 1976-12-08 1977-12-07 Controlled surface porosity particles and a method for their production
DE19772754360 DE2754360A1 (de) 1976-12-08 1977-12-07 Pulver aus oberflaechlich poroesen makroteilchen, seine herstellung und verwendung in der chromatographie
JP14770877A JPS5371699A (en) 1976-12-08 1977-12-08 Surface porous granules and method of making same
LU78660A LU78660A1 (sv) 1976-12-08 1977-12-08
CH1507977A CH625886A5 (sv) 1976-12-08 1977-12-08

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US05/748,770 US4070283A (en) 1976-12-08 1976-12-08 Controlled surface porosity particles and a method for their production

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JP (1) JPS5371699A (sv)
BE (1) BE861590A (sv)
CA (1) CA1088042A (sv)
CH (1) CH625886A5 (sv)
DE (1) DE2754360A1 (sv)
DK (1) DK149835B (sv)
FR (1) FR2373493B1 (sv)
GB (1) GB1584730A (sv)
IE (1) IE46009B1 (sv)
IT (1) IT1089345B (sv)
LU (1) LU78660A1 (sv)
NL (1) NL7713515A (sv)
SE (1) SE433009B (sv)

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US4382879A (en) * 1980-02-04 1983-05-10 Hitachi, Ltd. Material for adsorbing iodine and method for preparing thereof
US4495308A (en) * 1983-03-04 1985-01-22 Chevron Research Company Two-region spherical catalysts
US4519905A (en) * 1981-02-17 1985-05-28 The Dow Chemical Company High performance analytical column for anion determination
US4546090A (en) * 1983-04-27 1985-10-08 Minnesota Mining And Manufacturing Company Hollow zeolite-containing particles useful as refining catalysts
US4617060A (en) * 1984-04-23 1986-10-14 Mallinckrodt, Inc. Silica catalyst supports
US4783435A (en) * 1984-04-23 1988-11-08 Mallinckrodt, Inc. Silica catalyst supports
US4874511A (en) * 1986-03-07 1989-10-17 Koken Co., Ltd. Apatite chromatography column system
US4937394A (en) * 1984-04-23 1990-06-26 Mallinckrodt, Inc. Silica catalyst supports for hydration of ethylene to ethanol
US5037543A (en) * 1986-03-31 1991-08-06 Toa Nenryo Kogyo K.K. Assemblage of hydroxyl apatite particles and liquid chromatography column using the same
WO1992009364A1 (de) * 1990-11-29 1992-06-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur herstellung von formkörpern mit poröser oberfläche und enger oberflächenporenradienverteilung
US5145578A (en) * 1987-07-03 1992-09-08 Shiseido Company Ltd. Packing material for liquid chromatography
EP0544450A1 (en) * 1991-11-20 1993-06-02 Bar Ilan University Supported Microspheres
US5228989A (en) * 1989-07-06 1993-07-20 Perseptive Biosystems, Inc. Perfusive chromatography
US5403376A (en) * 1992-03-18 1995-04-04 Printron, Inc. Particle size distribution for controlling flow of metal powders melted to form electrical conductors
AU662344B2 (en) * 1989-07-06 1995-08-31 Perseptive Biosystems, Inc. Perfusive chromatography
US5652059A (en) * 1991-11-20 1997-07-29 Bar Ilan University Method for attaching microspheres to a substrate
US6319715B1 (en) * 2000-04-21 2001-11-20 Cornell Research Foundation, Inc. Method of enhancing the delivery of nucleic acids using silica nanoparticles
WO2002000338A1 (fr) * 2000-06-28 2002-01-03 Noritatsu Tsubaki Materiau poreux bimodal et catalyseur utilisant ce materiau
US20060070954A1 (en) * 2004-10-01 2006-04-06 Martosella James D Methods and systems for protein separation
US20060240633A1 (en) * 2004-10-01 2006-10-26 Agilent Technologies, Inc. Methods and systems for on-column protein delipidation
US20070235389A1 (en) * 2006-04-10 2007-10-11 Boyes Barry E Metal-coated superficially porous supports as a medium for HPLC of phosphorus-containing materials
US20070235390A1 (en) * 2006-04-10 2007-10-11 Boyes Barry E Titanium-coated sorbents as a separation medium for HPLC of phosphorus-containing materials
US20070256976A1 (en) * 2006-04-10 2007-11-08 Boyes Barry E Metal-coated sorbents as a separation medium for HPLC of phosphorus-containing materials
US20080272053A1 (en) * 2007-05-01 2008-11-06 Chandler Darrell P Combinatorial separations and chromatography renewable microcolumn
US20090053524A1 (en) * 2006-04-20 2009-02-26 Asahi Glass Company, Limited Core-shell silica and method for producing it
US20090221773A1 (en) * 2008-02-28 2009-09-03 Brigham Young University Methods for direct attachment of polymers to diamond surfaces and diamond articles
US20090218276A1 (en) * 2008-02-29 2009-09-03 Brigham Young University Functionalized diamond particles and methods for preparing the same
US20090277839A1 (en) * 2008-05-10 2009-11-12 Brigham Young University Porous composite particulate materials, methods of making and using same, and related apparatuses
US20100072137A1 (en) * 2008-09-22 2010-03-25 Brigham Young University Functionalized graphitic stationary phase and methods for making and using same
US20100213131A1 (en) * 2008-05-10 2010-08-26 Brigham Young University Porous composite particulate materials, methods of making and using same, and related apparatuses
US20110210056A1 (en) * 2010-02-26 2011-09-01 Brigham Young University Gas phase approach to in-situ/ex-situ functionalization of porous graphitic carbon via radical-generated molecules
CN102272239A (zh) * 2008-11-26 2011-12-07 爱尔兰国家大学科克学院 制备二氧化硅微粒的方法
US8658039B2 (en) 2010-11-17 2014-02-25 Brigham Young University Sonication for improved particle size distribution of core-shell particles
US9376540B2 (en) * 2013-01-25 2016-06-28 Eastman Kodak Company Particles with designed different sized discrete pores
US11691140B2 (en) 2019-10-24 2023-07-04 Uwm Research Foundation, Inc. Method for the preparation of controlled porosity supports for chromatographic separation

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US3782075A (en) * 1972-04-07 1974-01-01 Du Pont Completely porous microspheres for chromatographic uses
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US9005436B2 (en) 2008-05-10 2015-04-14 Brigham Young University Porous composite particulate materials, methods of making and using same, and related apparatuses
US9192915B2 (en) 2008-05-10 2015-11-24 Brigham Young University Porous composite particulate materials, methods of making and using same, and related apparatuses
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DK544877A (da) 1978-06-09
LU78660A1 (sv) 1978-07-11
BE861590A (fr) 1978-06-07
FR2373493B1 (sv) 1982-09-10
JPS5371699A (en) 1978-06-26
IT1089345B (it) 1985-06-18
SE7713893L (sv) 1978-06-09
FR2373493A1 (sv) 1978-07-07
CA1088042A (en) 1980-10-21
NL7713515A (nl) 1978-06-12
DE2754360A1 (de) 1978-06-15
DE2754360C2 (sv) 1990-03-15
SE433009B (sv) 1984-04-30
JPS6114858B2 (sv) 1986-04-21
GB1584730A (en) 1981-02-18
CH625886A5 (sv) 1981-10-15
IE46009L (en) 1978-06-08
DK149835B (da) 1986-10-13
IE46009B1 (en) 1983-01-26

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